Facebook has spotted a series of pages and accounts suspected of working to politically manipulate users, the social media giant announced Tuesday. The social network is ramping up its efforts to stop election meddling heading into the 2018 U.S. midterms. The company said it spotted dozens of “inauthentic accounts” on both Facebook and Instagram as part of its investigation. Facebook hasn’t tied the accounts to the Internet Research Agency — the Kremlin-linked troll factory that leveraged the platform to spread misinformation before the 2016 presidential election — and doesn’t know who is behind the coordinated accounts. “It’s clear that whoever...